no such option: --global-option

When trying to install with pip, I get `no such option: --global-option`
`--global-option` is [deprecated](https://github.com/pypa/pip/issues/11859)...

The alternative is to do this:
```
git clone https://github.com/openvenues/pypostal
cd pypostal
python setup.py build_ext -I[...libpostal checkout...]\headers -L[...libpostal checkout...]
python setup.py install --user
```